Uniform Circular Motion.

What angular speed (in revolutions per
minute) is needed for a centrifuge to produce
an acceleration of 675 times the gravitational
acceleration 9.8 m/s2 at a radius of 15.4 cm?
Answer in units of rev/min.

2. Relevant equations
ac=4 pi2 r f2

3. The attempt at a solution
ok so first I found the acceleration which is 110.25 m/m2 and I converted the radius to meters r= .154 m then I solved for the frequency = ((110.25)/(4pi2.154))1/2 = 1979.137 rpm
and my answer was wrong. Can you please tell me what error I made. thank you

What angular speed (in revolutions per
minute) is needed for a centrifuge to produce
an acceleration of 675 times the gravitational
acceleration 9.8 m/s2 at a radius of 15.4 cm?
Answer in units of rev/min.

2. Relevant equations
ac=4 pi2 r f2

3. The attempt at a solution
ok so first I found the acceleration which is 110.25 m/m2 and I converted the radius to meters r= .154 m then I solved for the frequency = ((110.25)/(4pi2.154))1/2 = 1979.137 rpm
and my answer was wrong. Can you please tell me what error I made. thank you